any of several plants regarded as turning with the movement of the sun.
a European plant, Chrozophora tinctoria, of the spurge family, yielding a purple dye.
the purple dye prepared from this plant; litmus.
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How to use turnsole in a sentence
The lower part from a was filled with water tinged blue, or rather purple, with the juice of turnsole, or archil.Experiments and Observations on Different Kinds of Air | Joseph Priestley
He styles the colouring substance itself cutbear, persio, or turnsole; and distributes the lichens as follows:—1st.
The lichen which produces archil is subjected to another preparation, to make turnsole (litmus).
A violet tint is given by the tinctures of turnsole and cochineal.
British Dictionary definitions for turnsole
any of various plants having flowers that are said to turn towards the sun
a euphorbiaceous plant, Croton tinctoria, of the Mediterranean region that yields a purple dye
the dye extracted from this plant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012